"Stay away from floodwaters as they could be contaminated or hazardous," locals were advised.
"Wash your hands if you've been in contact.
"Please don't 'rubberneck' in flood-affected areas. This situation is distressing for the people that own those homes and cars driving through can push water back into houses."
Boil water notices remain in place for Westport, Carters Beach and surrounding areas.
Water conservation notices are also in place in those areas and also for Punakaiki and Inangahua Junction.
"Residents are also reminded to minimise the use of toilets, showers, washing machines and dishwashers, which add load to the town sewerage system."
While some roads opened for use last night, SH 6 Inangahua to Westport - Lower Buller Gorge is still closed.
Residents have been asked to stay put and only travel when it was essential, and only if it was safe.
A number of Westport streets are still closed or limited to 4WD access only.
"Please only drive if absolutely necessary as driving through flooded areas can cause damage to neighbouring properties," said the BEMC spokesman.
MetService today said there was a "strong hint" the affected area may be in for more wet weather.l
"A band of rain passes over on Wednesday which looks to be briefly heavy - this lingers into Thursday but then another run of dry weather is forecast.," it said.
Assessments were also ongoing around farms to confirm how many stock have been lost.
Authorities said last night they were aware of one farmer who had lost 700 animals at least.
The farm owner did not want to speak about the situation yet.
Yesterday the Government announced a $300,000 helping hand to Westport through a mayoral relief fund and a further $100,000 for the Blenheim-Marlborough region.
And a separate $200,000has been committed for flood-affected farmers and growers across both areas.
Civil Defence, police, NZ Army personnel and other volunteers are out in force today helping locals and working on property assessments.
Further updates on the situation are due later today.
Meanwhile locals were working hard to help each other out with a number of people offering trucks to move property and a donation collection point.
People were urged to drop off things that could help those displaced - including clothing, personal items, blankets and baby supplies - and anyone in need was welcome to pick up what they required.
Local couple Samara and Mike File have also teamed up with the owners of the local Fresh Choice supermarket to start a flood relief fund with all donations going towards affected families.